Expandable sealing mechanism



FIG. 1 is a perspective view of an expansion band showing our new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof; and,

FIG. 5 is a side elevation view thereof, it being understood that left and right side views of the sealing assembly are identical.

The broken lines in the figures represent portions of the expandable sealing mechanism that form no part of the claimed design. 

CLAIM The ornamental design for an expandable sealing mechanism, as shown and described. 